Weft detector for regularly moving transferrer arms



Nov. 29,1921. 1,651,107

K. .1. UNWIN WEFT DETECTOR FOR REGULARLY MOVING TRANSFERRER ARMS Filed A112. e. 1926 W y if III-Ill l Patented Nov. 29, 1927.

1,651,10'? PATENT CJYFFICE.

KENNETH if nnw'rn, "or wo'ncnsrsn', nassacnnsnr'rs,'assrenontto cno'rir'r'on '& KNOWLES Loon 'wo'nKs, or won cnsrnn, MASSACHUSETTS, A c'o'neona'rron or MASSACHUSETTS.

'wnrrnn'r'neaion For; REGULAR-LY Movms mnerts'rnnnn'n ARMS.

Application filed Augttst '6, I926. Serial No. 127;698.

This invention relates to improvements in weft detectors of the type mounted on reg-ularly moving transfer-rer arms for weft replenishing looms and it is the principal object oi the invention 'toprovide simplified means for restoring both the weft detect-or and the carrier therefor to normal position. In copending application Serial #120391 there is shown a transferrer arm havingpivotal'ly mounted thereon a carrier lever which supports a side slipping wet-t detector. In that application there are shown two sepm rate springs, one a-cting on the carrier lever to raise the same to normal position and the other-co-mi-ected to the carrier lever and the detector to move the latter to nor-1nal,position. It is an important object of my present invention to provide a single spring so mounted that the same can be divided into two sections which will exert relatively different degrees of pressure on the carrier lever and the detector.

It is a further object of my invention to provide the carrier lever with an adjustable clip to engage the spring and separate the same in two parts, .said 'clip being movable to vary the point at which the pressure of one section is applied to tne carrier lever. It is a still further object of my invention to provide a connection between the spring and carrier lever permitting quick adjust ment of said spring, said connection having preferably a notci to receive one or another of the coils of the spring, depending upon the adjustment desired. QJith these and other objects in view which will appear as the description proceeds, my invention resides in the combination and ar; rangement of parts hereinafter described and set forth in the-claims. v

in the accompanying drawings, wherein I havesho'wn one form of my invention,

Fig. 1 is a vertical longitudinal section thru that portion of "the trans t-error arm which extends over and pa allel to the 'bobbin to be detected, showing the detector in Contact with a :t'ull supp'ly of weft,

Fig. 2is-a view similar to l btit with parts moved to indicating position,

Fig. 3 is a vertical section on line. 3-3 of Fig. '2 and Fig. 4 is an enlarged vertical section -on line 44 of Fig, 3.

Referring to the drawings it will be seen that I have provided a transferre'r arm 10 having a portion 11 extending above and parallel to the bobbin WVand having slidahly mounted therein a plunger '12 formed with a shoulder 13 which receives the right hand thrust on a compression spring ll as seen in Figs. 1 and 2. The left hand end of spring 14 bears against the web 1'5t13il11't1 which extends a reduced shank 16 of the plunger 12. Pinl? is passed thru the shank and limits right hand movement of the plunger under action of the Sprin The mechanism for normally holding plunger 12in the inoperative position shown in 1 comprises a latch 18 pivoted on pin 19 mounted in the t-ransiferrer arm. Said latch has a hook-20 which is held ina notch 21 formed in the shank 16 by a torsion spring 22, one end of which as indicated at 23 eX tends over a part of the portion 11 "and the other end as indicated at 24 extends over the latch 18, the intermediate portions being coiled around stud or pin 19. Said latch is provided with a depending arm 25 moved-to the right from the position shown in F 1 at the time of indication of substantial weft exhaustion-to release the plunger.

The detector 26 has a curvedya-r-n engaging toothed surface 27 and is pivoted as :at 28- to a lever 29 which in turn is pivotally mounted l or free movement on a stud 30 secured to the trans'ferrer arm, Said lever 29 has a tail 31 which normally engages that port-ion oi the transferrer arm which serves-as a housing for the plunger The detector 26 hasan upstanding arm 32provided with a series of holes 3EXloca'ted at dinerent distances from the pivot 28 and there is provided a stop screw 3d carried by the arm and engaging a projection 35 formed as part of the lever 29. The matter thus far described may b'e substantially'the same as is shown in the, 'foresaid application and forms no part of my present invention.

In carrying outfmy pre'sent improve ments '1 provide a relatively longtension spring 50 one end of which extends thru one or another 01 the openings 83 and the other end of which is straightened and held under a screw '51, said screwa'tiording means to adjust the tension of the spring. The intermediate portion of the spring .50 engages a clip 52 the upper portion which is provided with a "notch 53 and the lower pertion of which extends horizontally along a portion of the lever 29 and is formed with a slot 54 thru which extends a holding screw 55. By means of the slot and screw the position of the clip may be changed relatively to arm 29 and the screw 51. One of the coils of the spring is received by the notch 53 as shown in Figs. 3 and l, the bottom of said notch extending above straight line joining the ends of the spring, the resilience of said spring holding the selected coil in the notch. The clip serves to divide the spring in two sections A and B the tension of which can be varied by having one or another of the coils of the spring received by the notch 53. A further adjustment is rendered possible by means of screw 51, and the pressure of section A on the detector can be varied by means of the holes 33. The bottom of the notch is spaced an appreciable distance above the pin 30 so that the section B of the spring will hold the lever 29 in raised position indicated in Fig. 1. I

In the normal operation of the loom the transferrer arm 10 is caused to move downwardly toward the bobbin W on each detecting beat of the loom by mechanism not shown and is brought to a sudden stop when arriving at the position shown in Fig. 1 relatively to the bobbin, as set forth in Patent #1,372,316. The carrier lever 29, however, being freely movable about stud 30, continues its downward movement and carries the detector into contact with the weft on the bobbin. If sufficient weft is present for continued weaving, as is indibe present, however, the detector teeth willnot be restrained by yarn and as they lie to one side of a Vertical line passing thru the stud 28 said detector will slide along the bobbin to the position indicated in Fig. 2, en-

gaging the arm 25 and lifting the hook out of engagement with the plunger 12. The latter will move to the position indicated in Fig. 2 under influence of the compression spring 14 and an indication of weft exhaustion will be given to the replenishing mechanism not shown as the transferrer arm ascends as set forth in the aforesaid patent.

When it isdesired'to render the detector rather stiff in action the number of coils in the section A can be reduced and if this results in a sluggish upward action of carrier lever 29 a corresponding adjustment of section B can be effected by screw 51. The

variation of the relative strengths of sections A and B can be accomplished very readily by liftino the spring out of the notch 53 and placing 1n the latter another of the coils of the spring.

From the foregoing it will be seen that I have provided a weft detector mounted on the regularly moving transferrer arm and having a single spring operatively connected both to the detector and the carrier lever therefor in such a. way as to move these parts to normal raised position and being mounted and supported in such a way as to afford very ready means for adjusting the tension of the two sections A and B ofthe detector. Furthermore, each end of the spring is adjustable so that the pressure brought to bear upon either the detector or the carrier lever may be varied without dis turbmg the pressure of the other end of thespring. It will also be noted that the clip is adjustable along the carrier lever 29 to vary the point of application of section 'B to said carrier.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

1.. In weft detecting mechanism for looms having a regularly moving transferrer arm, a weft detector, a carrier supporting the detector and connected to the transferrer arm for relativemovement therewith and free to continue its movement toward a sur-] face to be detected as the transferrer comes to rest and an indicating mechanism actuable by the detector, said weft detecting mechanisln including a resilient member connected at one end to the detector and at the other end to the transfer-rel arm and having operative engagement at an intermediate point. thereof with the carrier for the detector, said resilient member tending to hold the carrier in raised position and the detector in normal position and yieldingly resisting detecting and indicating movement of said detector. v

2. In weft detecting mechanism for looms having a regularly moving transferrer arm, a weft detector, a carrier supporting the de-- tector and connected to the transferrer arm for relative movement therewith and free to continue its movement toward a surface to be detected as the transferrer comes to rest and an indicating mechanism actuable by the detector, said weft detecting mechanism including a spring operatively connected at one end tothe detector and at the other end thereof connected to the transferrer arm, and a memberup standing from the carrier and engaging said spring at a point intermediate the ends thereof to divide the same into two sections, one section acting on the detector and the other section acting on the carrier.

3. In weft detecting mechanism for loooins having a regularly moving transferrer arm, a weft detector, a carrier supporting the detector and connected to the transferrer arm for relative movement therewith and free to continue its movement toward a surface to be detected as the transferrer comes to rest and an indicating mechanism actuable by the detector, said detecting mechanism including resilient means connected at one end to the transferrer arm and at the other end connected to the detector, and means movable with respect to and secured to the carrier to engage a portion of the resilient means and divide the latter into two sections one of which is effective to restore the Ge tector to normal position and the other section of which is effective to restore the carrier to normal position, the last named means being capable of a multiplicity of operative engagements with the resilient means to divide the latter into sections of varying degrees of resilience.

4. In weft detecting mechanism for looms having a regularly moving transferrer arm, a weft detect-or, a carrier supportingthe de tector and connected to the transferrer arm for relative movement therewith and free to continue its movement toward a surface to be detected as the transferrer comes to rest and an indicating mechanism actuable by the detector, said detecting mechanism including a tension spring operatively con nected at one end to the transferrer arm and at the other end thereof connected to the detector, a clip adjustably mounted on the carrier and having engagement with one of the coils of the spring, said clip dividing the spring into two sections lying on opposite sides of the clip, one of said sections acting on the detector to restore the latter to normal position and the other section acting on the carrier to move the same to normal position, said clip being capable of engagement with any one of a plurality of coils of the spring for varying the relative resilience of the sections.

5. In weft detecting mechanism for looms having a regularly moving transferrer arm,

- a weft detector, a carrier supporting the detector and connected to the transferrer arm for relative movement therewith and free to continue its movement toward a surface to be detected as the transferrer comes to rest and an indicating mechanism actuable by the detector, said detecting mechanism including resilient means connected to the transferrer arm and the detector and extending over the carrier and on both sides 'of the connection thereof with the transferrer arm, said resilient means tending to hold the detector and carrier in normal position relatively to the transferrer arm.

6. In weft detecting mechanism for looms having a regularly moving transferrer arm, a weft detector, a carrier supporting the detector and connected to the transferrer arm for relative movement therewith and free to continue its movement toward a surface to be detected as the transferrer comes to rest and an indicating mechanism actuable by the detector, said detecting mechanism including a pivoted connection between the carrier and the transferrer arm, and resilicnt means connected to the transferrer arm and extending on both sides of the pivoted connection in a direction parallelto the surface to be detected, and having operative contact at an intermediate point thereof with the carrier, said resilient means tending to hold the detector and carrier in normal yielding position relatively to the transferrer arm.

7. In weft detecting mechanism for looms having a regularly moving transferrer arm, a weft detector, a carrier supporting the detector and connected to the transferrer arm for relative movement therewith and free to continue its movement toward a surface to be detected as the transferrer comes to rest and an indicatingmechanism actuable by the detector, said weft detecting mechanism including a resilient longitudinal member connected at its ends to the detector and transferrer arm, respectively, and means moving with the carrier and engaging the member to divide the latter into two sections, one to hold the carrier in normal po sition and the other to hold the detector yieldingly in normal position relatively to the carrier, said member causing the axes of said sections to be oblique with respect to each other.

In testimony whereof I have hereunto affixed my signature.

KENNETH J. UNWIN. 

